JP2003266502A - Apparatus for controlling mold opening and method for controlling it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform sufficient mold releasing without destroying a mold apparatus accompanied with mold opening and to prevent a mold clamping apparatus from being stopped. <P>SOLUTION: An apparatus for controlling mold opening has a first platen, a first mold provided with a slide member, a second platen, a second mold provided with an angular pin 22 to be engaged with the slide member, a driving part, and a mold opening force generating and processing means which increases a mold opening force from starting of the mold opening to finishing of mold releasing and decreases the mold opening force when the mold releasing is finished. As the mold opening force is increased from starting the mold opening to finishing the mold releasing, an enough mold releasing can be performed without decreasing mold releasing properties and regardless of the shape, the dimension and the like of a molded article and the mold clamping apparatus can be prevented from being stopped. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold opening control device and a control method thereof.

[0002]

2. Description of the Related Art Conventionally, in an injection molding machine, a resin heated and melted in a heating cylinder is filled in a cavity space of a mold device, and is cooled and solidified in the cavity space. The molded product is molded by.

To this end, the mold unit is composed of a fixed mold and a movable mold, and the movable mold is advanced and retracted by driving a mold clamping cylinder of the mold clamping device, a mold clamping motor, and the like, and the fixed mold is fixed. The mold is closed, the mold is closed and the mold is opened by bringing the mold into and out of contact with the mold. And
A control device is provided for driving the mold clamping cylinder, the mold clamping motor, and the like, and the controller performs mold opening / closing position control to control the position of the movable mold and the mold clamping force. Or

By the way, when molding a molded product having an undercut, the mold opening is performed by using a mold device having a slide core in one of a fixed mold and a movable mold and an angular pin in the other. The slide core is moved as it is heard.

However, in this type of mold device,
For example, when galling occurs on angular pins, slide cores, etc. during mold opening, the mold clamping device generates a normal mold opening force to open the mold, and the slide core follows the movement of the movable mold. Cannot be done, and the die device is damaged. Therefore, in the mold clamping device, a mold opening force smaller than usual is generated to perform mold opening so that the galling does not occur.

[0006]

However, in the above-mentioned conventional injection molding machine, the mold releasability is reduced by the amount that the mold opening force is reduced, and sufficient mold release is performed depending on the shape and size of the molded product. It may not be possible and the mold clamping device may stop.

According to the present invention, the problems of the conventional injection molding machine are solved, and the mold device is not damaged as the mold is opened, and the mold can be released sufficiently. An object of the present invention is to provide a mold opening control device and a control method thereof that can prevent the mold clamping device from stopping.

[0008]

Therefore, in the mold opening control device of the present invention, a first platen, a first mold attached to the first platen and provided with a slide member, and a first mold are provided. A second platen, a second mold having an angular pin attached to the second platen and engaged with the slide member, and one of the first and second platens. Then, the mold closing, mold closing and mold opening are performed, and the mold opening force is applied from the drive unit for generating the mold clamping force and the mold opening force to the mold releasing from the start of the mold opening. After making it bigger and releasing,
And a mold opening force generation processing means for reducing the mold opening force.

In another mold opening control device of the present invention, the mold opening force generation processing means further reduces the mold opening force and then releases the engagement between the angular pin and the slide member. Increase opening force.

In still another mold opening control device of the present invention, the mold opening force generation processing means increases the mold opening force when the mold opening speed becomes lower than a threshold value after reducing the mold opening force. .

In still another mold opening control device of the present invention, the mold opening force generation processing means further increases the mold opening force, and when the mold opening force becomes equal to or more than the mold opening force upper limit value, the mold opening force is increased. To cancel.

In the control method of the mold opening control apparatus according to the present invention, the first platen, the first mold attached to the first platen and provided with the slide member, the second platen, the second platen. A second mold attached to a platen and provided with an angular pin that is engaged with the slide member, and one of the first and second platens is moved to close the mold, close the mold, and mold. It is adapted to be applied to a mold opening control device having a drive unit for performing mold opening and generating a mold clamping force and a mold opening force.

After the mold opening is started, the mold opening force is increased until the mold releasing is completed, and when the mold releasing is completed, the mold opening force is reduced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a conceptual diagram of a mold opening control device according to an embodiment of the present invention, FIG. 2 is a first diagram showing the operation of the mold device according to the embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. 2 is a flow chart showing the operation of the mold opening control device according to the embodiment of the present invention, and FIG. 5 is a flowchart showing the operation of the mold opening control device according to the embodiment of the present invention. It is a time chart which shows operation.

In FIGS. 1 to 3, 11 is a fixed platen as a first platen, 14 is arranged so as to face the fixed platen 11, and advances and retreats along a tie bar (not shown) (left and right in FIGS. 1 to 3). A movable platen as a second platen that is movably disposed, and a fixed mold 15 as a first mold is provided on a surface of the fixed platen 11 facing the movable platen 14, and the movable platen is also provided. A movable mold 16 as a second mold is attached to the surface of 14 facing the fixed platen 11. The fixed mold 15 and the movable mold 16 constitute a mold device 13. An ejector device (not shown) is arranged at the rear end of the movable platen 14 (the left end in FIGS. 1 to 3).

The fixed mold 15 includes a core 17 and a movable platen 14 at a predetermined position of the core 17.
Direction (arrow B)
The slide core 18 is provided as a slide member movably arranged in the direction). The movable mold 16 includes the core 2
1 and the angular pin 2 which is disposed at a position corresponding to the slide core 18 in the core 21 and is inclined at a predetermined angle with respect to the moving direction of the movable platen 14.
2 is provided. A hole 24 is formed in the slide core 18 by inclining it by the same angle as the angular pin 22 with respect to the moving direction of the movable platen 14. In the present embodiment, the fixed mold 15 is attached to the slide core 18.
However, although the angular pin 22 is arranged on the movable mold 16, the angular pin is fixed on the fixed mold 15.
The movable mold 16 may be provided with a slide core.

The rear of the movable platen 14 (see FIGS.
A mold clamping cylinder 25 as a drive unit for mold clamping is disposed on the left side of FIG. By driving the mold clamping cylinder 25, mold closing, mold clamping and mold opening of the mold device 13 are performed, and a mold clamping force can be generated during mold clamping and a mold opening force can be generated during mold opening. Therefore, the mold clamping cylinder 25 includes a piston 41, and a first oil chamber 42 is provided behind the piston 41 (left side in FIG. 1, which is a side away from the movable platen 14) and in front of the piston 41 (movable platen 14). The second oil chamber 4 is located on the right side in FIG.
3, the pressure oil from the hydraulic pressure source 44 is selectively supplied to the first and second oil chambers 42 and 43 through the hydraulic servo 45. The fixed platen 11, the movable platen 14, the mold clamping cylinder 25, and the like constitute a mold clamping device 26. In the present embodiment, the mold clamping cylinder 25 is used as a drive unit for mold clamping, but instead of the mold clamping cylinder 25, an electric motor, for example, a servomotor is driven, It is also possible to move the movable platen 14 forward and backward by converting the rotational movement of the servo motor into a linear movement.

The first oil pressure sensor 46 for detecting the pressure of the pressure oil supplied to the first oil chamber 42 is
Second hydraulic pressure sensors 47 are respectively arranged to detect the pressure of the pressure oil supplied to the oil chamber 43, and the detection signals of the respective pressures detected by the first and second hydraulic pressure sensors 46, 47. Are sent to the controller 32. The mold clamping force detection processing means (not shown) of the control device 32 performs the mold clamping force detection process, detects the mold clamping force based on the pressure detected by the first hydraulic pressure sensor 46, and controls the control device 32. The mold opening force detection processing means (not shown) performs mold opening force detection processing,
The mold opening force is detected based on the pressure detected by the second hydraulic pressure sensor 47.

Next, the operation of the mold clamping device 26 having the above construction will be described.

First, when the mold is closed, the hydraulic servo 45 is operated to supply a predetermined pressure oil to the first oil chamber 42, thereby driving the mold clamping cylinder 25 and moving the piston 41 forward (to the right in FIG. 1). When the movable platen 14 is moved forward by moving the movable mold 16 to the fixed mold 15
And the mold is closed. Along with this, a cavity space (not shown) is formed between the movable mold 16 and the fixed mold 15.

Next, when the mold clamping is performed, the hydraulic servo 45 is operated to increase the pressure of the pressure oil supplied to the first oil chamber 42 above the predetermined value, thereby further driving the mold clamping cylinder 25. A predetermined mold clamping force is generated, the movable mold 16 is pressed against the fixed mold 15 by the mold clamping force, and mold clamping is performed. Therefore, the mold clamping force generation processing means (not shown) of the control device 32 performs the mold clamping force generation process, and based on the detected mold clamping force and the mold clamping force command preset by the setter 51, Generates a predetermined mold clamping force.

A resin as a molding material injected from an injection nozzle of an injection device (not shown) is filled in the cavity space, and the resin is cooled and solidified in the cavity space to mold a molded product. It

When the mold is opened, the hydraulic servo 45 is operated to supply the pressure oil having a predetermined pressure to the second oil chamber 43, thereby driving the mold clamping cylinder 25 in the reverse direction and retracting the piston 41. When the movable platen 14 is moved backward (by moving it to the left in FIG. 1), a predetermined mold opening force is generated, and the movable mold 16 is separated from the fixed mold 15 by the mold opening force. Opening is done. Along with the mold opening, the ejector device is operated, and the molded product is ejected by an ejector pin (not shown) to release the mold.

By the way, when molding a molded product having an undercut, as described above, the hole 24 is formed in the slide core 18 at the same inclination as that of the angular pin 22, and as shown in FIG. 14 for arrow C
When retracted in the direction, the slide core 18 is moved in the arrow D direction according to the inclination of the angular pin 22.
In the mold device 13 of this type, when the mold clamping device 26 generates a normal mold opening force to perform mold opening, a reaction force generated as the angular pin 22 is moved in the slide core 18 is generated. The slide core 18 is added to the angular pin 22 so that the slide core 18 can move to the movable mold 16
Cannot follow the movement of the mold, resulting in galling of the angular pin 22, the slide core 18, etc., and the mold device 13 is damaged.

Therefore, in the present embodiment, a position detector 31 is provided so as to face a predetermined position of the movable platen 14, for example, the top wall, and the position detector 31 is used to position the movable platen 14. The mold opening position represented by is detected. And the position detector 3
The detection signal of the mold opening position detected by 1 is sent to the control device 32, and the speed detection processing means (not shown) of the control device 32 performs the speed detection process and differentiates the mold opening position to differentiate the mold opening speed. To detect.

A mold opening force generation processing means (not shown) of the control device 32 performs a mold opening force generation process, drives the mold clamping cylinder 25 in correspondence with the mold opening position, and corresponds to the mold opening position. Generates mold opening force. Therefore, as shown in FIG. 5, a mold opening force command as shown in line L1 is set by the setting device 51, and the mold opening force generation processing means is detected by the mold opening force detection processing means. Based on the mold opening force and the mold opening force command, the mold opening force as shown by the line L2 is generated.

First, when the mold opening is started at the timing t1, the mold opening force generation processing means detects the detected mold opening force,
Also, the maximum mold opening force is generated based on the maximum mold opening force command f1 set by the setting device 51. Next, when the molded product separates from the core 21 at timing t2 and the detected mold opening force becomes small, the mold opening force generation processing means recognizes that the mold releasing has been performed, and is set by the setting device 51. The minimum mold opening force is generated based on the initial mold opening force command f2.

Then, the mold opening force generation processing means continues the mold opening while generating the minimum mold opening force, but the reaction force applied from the slide core 18 to the angular pin 22 increases accordingly, and the slide operation is performed. The resistance when moving the core 18 in the direction of the arrow D increases.

Therefore, the mold opening force generation processing means sets a mold opening force command in advance when the mold opening speed detected by the speed detection processing means becomes lower than the first threshold value fth1. Increase by a small addition value Δf1,
The mold opening force is generated based on the new mold opening force command, and the mold opening force is increased. When the mold opening speed becomes equal to or higher than the first threshold value fth1 by generating the mold opening force based on the new mold opening force command, the mold opening force generation processing unit gives a new mold opening force command. Based on this, the mold opening is continued while the mold opening force is generated. Also, the detected mold opening speed is the first
Second threshold value fth higher than the threshold value fth1 of
When it becomes higher than 2, the mold opening force generation processing means lowers the mold opening force command by a preset minute subtraction value Δf2, and generates the mold opening force based on the new mold opening force command, and the mold opening force is generated. Is reduced.

Then, at the timing t3, the movable platen 1
4 reaches the mold opening position S1 and the angular pin 22 is in the hole 2
After coming out of No. 4, angular pin 22 and slide core 18
When the engagement with and is released, the mold opening force generation processing means generates the maximum mold opening force based on the detected mold opening force and the mold opening force command f1, and continues the mold opening. After that, when the movable platen 14 reaches the mold opening limit position S2 at timing t4, the mold opening force generation processing unit sets the mold opening force command to zero (0) and stops the movable platen 14. In this way, the mold opening is completed.

By the way, the mold opening force command is set to a small addition value Δf.
Even after the mold opening force is increased by 1 and the mold opening force is generated based on the new mold opening force command, the detected mold opening speed is the first threshold fth.
If it remains lower than 1, the mold opening force generation processing means repeatedly increases the mold opening force command by a small addition value Δf1, as indicated by line L3. Then, at timing tm, the pressure of the pressure oil detected by the second hydraulic pressure sensor 47 becomes equal to or higher than the pressure oil upper limit value, and the detected mold opening force becomes equal to or higher than the mold opening force upper limit value fm. The generation processing unit sets the mold opening force command to zero and stops the movable platen 14. In this way, the mold opening is stopped.

Thus, since the mold opening force is increased from the start of mold opening to the end of mold release, the mold releasability does not decrease, and regardless of the shape or size of the molded product, Sufficient mold release can be performed, and further, the mold clamping device 26 can be prevented from stopping. Further, since the mold opening force is reduced from the end of the mold release until the engagement between the angular pin 22 and the slide core 18 is released, the mold opening is performed and the angular pin 22 is moved inside the slide core 18. Even if a reaction force generated by moving the slide core 18 is applied to the angular pin 22 from the slide core 18, the slide core 18 can follow the movement of the movable mold 16. Therefore, the angular pin 22 and the slide core 1
It is possible to prevent the die device 13 from being damaged without galling of the die 8 and the like.

Further, after the engagement between the angular pin 22 and the slide core 18 is released, the mold opening force is increased until the mold opening is completed, so that the molding cycle of the injection device can be shortened.

When the mold opening force becomes greater than the mold opening force upper limit value fm after the mold opening force is increased, the mold opening is stopped, so that the angular pin 22, the slide member 18, etc. are galled. It is possible to reliably prevent the mold device 13 from being damaged.

Next, the flowchart will be described. Step S1 The mold opening is started. In step S2, the maximum mold opening force is generated. Step S3: Wait for the mold release. Step S4: A minimum mold opening force is generated. In step S5, it is determined whether the mold opening speed is lower than the first threshold value fth1. If the mold opening speed is lower than the first threshold value fth1, the mold opening speed is set to the first threshold value f in step S6.
If th1 or more, the process proceeds to step S9. In step S6, the mold opening force is increased. In step S7, it is determined whether the mold opening force is equal to or more than the mold opening force upper limit value fm. When the mold opening force is equal to or more than the mold opening force upper limit value fm, the process proceeds to step S8, and when the mold opening force is lower than the mold opening force upper limit value fm, the process proceeds to step S11. In step S8, the mold opening is stopped and the process ends. In step S9, it is determined whether the mold opening speed is higher than the second threshold value fth2. If the mold opening speed is higher than the second threshold value fth2, the process proceeds to step S10. If the mold opening speed is equal to or lower than the second threshold value fth2, the process proceeds to step S11. Step S10 The mold opening force is reduced. Step S11 Angular pin 22 and slide core 1
It is determined whether the engagement with 8 is released. If the engagement between the angular pin 22 and the slide core 18 is released, the process proceeds to step S12, and if not released, the process returns to step S5. In step S12, the maximum mold opening force is generated. Step S13: Wait for the movable platen 14 to reach the mold opening position S2, and when it reaches, the process is terminated.

The present invention is not limited to the above-mentioned embodiments, but can be variously modified within the scope of the present invention, and they are not excluded from the scope of the present invention.

[0038]

As described above in detail, according to the present invention, in the mold opening control device, the first platen and the first metal having the slide member attached to the first platen are provided. A mold, a second platen, a second mold provided with an angular pin attached to the second platen and engaged with the slide member, and any one of the first and second platens One of them is moved to perform mold closing, mold clamping and mold opening, and a drive unit for generating mold clamping force and mold opening force, and until the mold release is completed after the mold opening is started. And a mold opening force generation processing means for decreasing the mold opening force when the mold opening force is increased and the mold release is completed.

In this case, since the mold opening force is increased from the start of the mold opening to the end of the mold releasing, the mold releasability is not deteriorated, and the mold is sufficiently shaped regardless of the shape or size of the molded product. It is possible to perform easy mold release and prevent the mold clamping device from stopping. Further, since the mold opening force is reduced from the end of the mold release until the engagement between the angular pin and the slide member is released, the mold opening is performed and the angular pin moves along with the movement within the slide member. Even if the reaction force generated as a result is applied to the angular pin from the slide member, the slide member can follow the movement of the second mold. Therefore, galling does not occur on the angular pin, the slide member, etc., and it is possible to prevent the mold device from being damaged.

In another mold opening control device of the present invention, the mold opening force generation processing means further reduces the mold opening force and then releases the engagement between the angular pin and the slide member. Increase opening force.

In this case, since the mold opening force is increased until the mold opening is completed after the engagement between the angular pin and the slide member is released, the molding cycle of the injection device can be shortened.

In still another mold opening control device of the present invention, the mold opening force generation processing means further increases the mold opening force, and when the mold opening force exceeds the mold opening force upper limit value, the mold opening force is increased. To cancel.

In this case, after the mold opening force is increased, if the mold opening force exceeds the upper limit value of the mold opening force, the mold opening is stopped, so that the angular pin, the slide member, etc. are less likely to be galled. Therefore, it is possible to reliably prevent the mold device from being damaged.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a mold opening control device according to an embodiment of the present invention.

FIG. 2 is a first diagram showing an operation of the mold device according to the embodiment of the present invention.

FIG. 3 is a second diagram showing the operation of the mold device according to the embodiment of the present invention.

FIG. 4 is a flowchart showing an operation of the mold opening control device according to the embodiment of the present invention.

FIG. 5 is a time chart showing the operation of the mold opening control device according to the embodiment of the present invention.

[Explanation of symbols]

11 Fixed platen 14 Movable platen 15 Fixed mold 18 slide core 22 Angular Pin 25 mold clamping cylinder 32 control device

Claims (5)

[Claims] 1. (a) a first platen; and (b) the first platen.
Attached to the platen of the first with a slide member
(C) a second platen, (d) a second mold having an angular pin attached to the second platen and engaged with the slide member, and (e) the second mold. A drive unit for moving either one of the first and second platens to perform mold closing, mold clamping and mold opening, and to generate mold clamping force and mold opening force, and (f) the mold. The mold opening control is characterized by having a mold opening force generation processing means for increasing the mold opening force from the start of the opening to the end of the mold releasing, and decreasing the mold opening force when the mold releasing is completed. apparatus. 2. The mold according to claim 1, wherein the mold opening force generation processing unit increases the mold opening force when the engagement between the angular pin and the slide member is released after the mold opening force is reduced. Open control device. 3. The mold opening control device according to claim 1, wherein the mold opening force generation processing unit increases the mold opening force when the mold opening speed becomes lower than a threshold value after reducing the mold opening force. 4. The mold opening control device according to claim 3, wherein the mold opening force generation processing means stops the mold opening when the mold opening force is equal to or more than the mold opening force upper limit after increasing the mold opening force. . 5. A first platen, a first mold attached to the first platen and provided with a slide member, a second platen, attached to the second platen and engaged with the slide member. Second with Angular Pins made
Of the mold and one of the first and second platens is moved to perform mold closing, mold clamping and mold opening, and a drive unit for generating mold clamping force and mold opening force. In the control method of the mold opening control device having, the mold opening force is increased until the mold releasing is completed after the mold opening is started, and the mold opening force is reduced when the mold releasing is completed. Control method for mold opening control device.